- [Instructor] I hope you enjoy your experimentation.…Let me evaluate the entire notebook.…You may have found another solution,…but I was able to improve on our best model so far…by going beyond the linear dependence on age five surviving…and adding a quadratic term.…

I will use my code and replace the formula.…The cross validation means Quintero is about .94.…If you were not able to guess the right syntax…for adding a power to the formula,…you could have done it differently…by adding a new column to the data.…You could have written g data age five surviving squared…is g data age five surviving to the second power.…

This warning is not a problem…since we don't need to modify the original…gap minder data frame, but just the subset we're using.…